超前液压支架群组–锚固耦合支护力学特性研究及实验验证

doi:10.13722/j.cnki.jrme.2020.1142

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Abstract In order to research the supporting mechanical characteristics of advanced hydraulic support group and bolt (cable) coupling support for surrounding rocks，the Mindlin-Reissner plate theory was employed to describe the mechanical characteristics of the surrounding rock，and the energy functional was used to describe the supporting force of the equivalent support group and the bolt(cable) action. A mechanical model of the advanced hydraulic support group-anchor coupling support of surrounding rocks was established，in which the penalty function was introduced to constraint the model boundary strategies and the system control equations were obtained based on Hamilton principle. According to the advanced support parameters of the 15106 working face in Wenjiazhuang coal mine of Pingshu company of Shanxi Yangquan Group，the deformations as well as the bending moment and stress distributions of the roof under three strategies including the anchor support，the equal strength support and the non-equal strength support were obtained by solving the model with Ritz method. Comparisons of the supporting effects among three supporting strategies show that，compared with the anchor support，the maximum displacement，the bending moment and the stress of the roof under advanced hydraulic support group anchor coupling support are reduced by 36.87%，35.85% and 47.81%，respectively，indicating that the coupling support can effectively maintain the stability of the roof，and that，compared with the equal strong coupling support，the maximum displacement，the bending moment and the stress of the roof under the non-equal strength coupling support condition are reduced by 10.29%，12.2% and 29.53%，respectively，proving that the non-equal strength coupling support was effective to maintain the stability of the surrounding rock. Consequently，a “continuous gradient” non-equal strength support strategy of advanced hydraulic support group anchor coupling support was put forward. Laboratory tests by using the three-dimensional similar simulation experiment platform designed by the Key Laboratory of Mine Subsidence Disaster Prevention and Control of Department of Education of Liaoning Province were carried out to verify the effectiveness of the “continuous gradient” non-equal strong coupling support strategy，and the experimental results were compared with the theoretical results. It is revealed that the maximum displacement error and the maximum stress error of the equal strength support and the non-equal strength coupling support were respectively 7.2 mm and 0.48 MPa and 5.9 mm and 0.19 MPa，showing the accuracy of the mechanical model and the effectiveness of the mechanical characteristics of the coupling support considering the experiment complexity. Finally，the field application experiment of the “continuous gradient” non-equal strength support strategy was carried out in the 15106 working face of Wenjiazhuang coal mine to verify the effectiveness of the research results. The research results provide a theoretical support for the safety and stability maintenance and the intelligent support control of deep mine surrounding rocks.

Key words： mining engineering advanced hydraulic support group coupling support non-equal strength support strategy mechanical properties similarity simulation experiment

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	ZHANG Kun1
	2
	3
	LI Yuxia1
	ZHONG Donghu4
	MENG Xiangjun2
	HUANG Qingxue3
	XU Yajun5
	CHEN Hongyue4
	MA Ying5
	ZHANG Desheng5
	HUANG Liangsong1
	SU Jinpeng1

Cite this article:

ZHANG Kun1,2,3, et al. Research and experimental verification of mechanical characteristics of advanced hydraulic support group-anchor coupling support[J]. , 2021, 40(7): 1428-1443.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.1142 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I7/1428

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